Method for powering elements connected in a two-wire bus network transmitting both power supply and data information pulses
First Claim
1. A method for powering elements connected in a two-wire bus type network wherein information frames of predetermined length are transmitted at predetermined times and wherein the bus includes terminal impedances, said method including the steps of regularly issuing on the two-wire bus a power supply pulse between the end of an information frame and the beginning of the next frame;
- disconnecting the terminal impedances when the amplitude of the power supply pulse exceeds a threshold value associated with a rising edge of the supply pulse; and
reestablishing the connection of the terminal impedances to the bus during a falling edge of the supply pulse.
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Accused Products
Abstract
The present invention relates to a powering method for elements connected in a two-wire bus type network wherein information frames of predetermined length are transmitted at predetermined times. The method consists of regularly sending on the two-wire bus a power supply pulse between the end of an information frame and the beginning of the next frame.
185 Citations
7 Claims
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1. A method for powering elements connected in a two-wire bus type network wherein information frames of predetermined length are transmitted at predetermined times and wherein the bus includes terminal impedances, said method including the steps of regularly issuing on the two-wire bus a power supply pulse between the end of an information frame and the beginning of the next frame;
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disconnecting the terminal impedances when the amplitude of the power supply pulse exceeds a threshold value associated with a rising edge of the supply pulse; and reestablishing the connection of the terminal impedances to the bus during a falling edge of the supply pulse. - View Dependent Claims (2, 3, 4, 5)
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6. A line terminator for a two wire bus, said two wire bus having a voltage applied there across, said line terminator comprising:
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a terminal impedance switchably connected across said two wire bus; a threshold detector for receiving the voltage level across said bus and associated with controller means for disconnecting the terminal impedance from the bus when the voltage level on the bus exceeds a first threshold VZoff and for reconnecting the terminal impedance to the bus when the voltage level on the bus goes below a second threshold VZON after having reached a maximum value VP as detected by said threshold detector. - View Dependent Claims (7)
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Specification